Artificial dialysis device

Abstract

A filter CF 1 for filtering dialysis fluid comprises the following: a housing 52 inside of which a filter material 51 is accommodated and which is vertically long; an introduction port 53 that is disposed in the lower part of the housing and that introduces dialysis fluid from an upstream-side flow path 23 a ; a filtered fluid lead-out port 54 through which filtered dialysis fluid, which has passed through the filter material, is lead out from the upper part of the housing to a downstream-side flow path 23 b ; and an unfiltered fluid lead-out port 55 through which unfiltered fluid is lead out from the upper part of the housing to a waste fluid flow path 57 . When removing the filter from a dialysis fluid circuit 4 , fluid is suctioned from the inside of the housing via the upstream-side flow path by using fluid suction means 64 A, and a gas is caused to flow into the housing from at least either one of the waste fluid flow path and the downstream-side flow path by using gas inflow means 65 . The fluid may be suctioned from the downstream-side flow path and the gas may be caused to flow in from the upstream-side flow path, or the fluid may be suctioned from the waste fluid flow path and the gas may be caused to flow in from the downstream-side flow path. Residual fluid in the filter can be reduced.

The invention claimed is: 
     
       1. A dialysis device comprising a dialysis fluid circuit for supplying a dialysis fluid to a dialyzer and a filter connected to the dialysis fluid circuit and filtering the dialysis fluid, characterized in that:
 the filter includes a cylindrical housing arranged with a longitudinal direction vertically and accommodating a filter material therein, an introduction port provided on a lower part of the housing and introducing the dialysis fluid into an inside, a filtered fluid lead-out port provided on an upper part of the housing for leading out a filtered dialysis fluid having passed through the filter material in the dialysis fluid having been introduced through the introduction port, and an unfiltered fluid lead-out port provided on an upper part of the housing for leading out unfiltered fluid not having passed through the filter material in the dialysis fluid having been introduced through the introduction port; 
 the dialysis fluid circuit includes an upstream-side flow path connected to the introduction port of the filter and causing the dialysis fluid to flow into the housing, a downstream-side flow path connected to the filtered fluid lead-out port of the filter and causing the filtered dialysis fluid to flow out from the inside of the housing, and a waste fluid flow path connected to the unfiltered fluid lead-out port and causing the unfiltered fluid to be discharged from the inside of the housing; and 
 fluid suction means capable of suctioning the fluid inside the housing through the upstream-side flow path and gas inflow means for causing a gas to flow into the housing through at least either one of the waste fluid flow path and the downstream-side flow path are provided in the dialysis fluid circuit; and 
 when the filter is to be removed from the dialysis fluid circuit by separating it from the upstream-side flow path, the downstream-side flow path, and the waste fluid flow path, the gas inflow means is opened, and the fluid in the housing is suctioned by the fluid suction means so as to discharge the fluid in the housing to an outside. 
 
     
     
       2. A dialysis device comprising a dialysis fluid circuit for supplying a dialysis fluid to a dialyzer and a filter connected to the dialysis fluid circuit and filtering the dialysis fluid, characterized in that:
 the filter includes a cylindrical housing arranged with a longitudinal direction vertically and accommodating a filter material therein, an introduction port provided on a lower part of the housing and introducing the dialysis fluid into an inside, a filtered fluid lead-out port provided on an upper part of the housing for leading out a filtered dialysis fluid having passed through the filter material in the dialysis fluid having been introduced through the introduction port, and an unfiltered fluid lead-out port provided on an upper part of the housing for leading out unfiltered fluid not having passed through the filter material in the dialysis fluid having been introduced through the introduction port; 
 the dialysis fluid circuit includes an upstream-side flow path connected to the introduction port of the filter and causing the dialysis fluid to flow into the housing, a downstream-side flow path connected to the filtered fluid lead-out port of the filter and causing the filtered dialysis fluid to flow out from the inside of the housing, and a waste fluid flow path connected to the unfiltered fluid lead-out port and causing the unfiltered fluid to be discharged from the inside of the housing; 
 fluid suction means capable of suctioning the fluid inside the housing through the downstream-side flow path and gas inflow means for causing a gas to flow into the housing through at least either one of the upstream-side flow path and the waste fluid flow path are provided in the dialysis fluid circuit; and 
 when the filter is to be removed from the dialysis fluid circuit by separating it from the upstream-side flow path, the downstream-side flow path, and the waste fluid flow path, the gas inflow means is opened, and the fluid in the housing is suctioned by the fluid suction means so as to discharge the fluid in the housing to an outside. 
 
     
     
       3. A dialysis device comprising a dialysis fluid circuit for supplying a dialysis fluid to a dialyzer and a filter connected to the dialysis fluid circuit and filtering the dialysis fluid, characterized in that:
 the filter includes a cylindrical housing arranged with a longitudinal direction vertically and accommodating a filter material therein, an introduction port provided on a lower part of the housing and introducing the dialysis fluid into an inside, a filtered fluid lead-out port provided on an upper part of the housing for leading out a filtered dialysis fluid having passed through the filter material in the dialysis fluid having been introduced through the introduction port, and an unfiltered fluid lead-out port provided on an upper part of the housing for leading out unfiltered fluid not having passed through the filter material in the dialysis fluid having been introduced through the introduction port; 
 the dialysis fluid circuit includes an upstream-side flow path connected to the introduction port of the filter and causing the dialysis fluid to flow into the housing, a downstream-side flow path connected to the filtered fluid lead-out port of the filter and causing the filtered dialysis fluid to flow out from the inside of the housing, and a waste fluid flow path connected to the unfiltered fluid lead-out port and causing the unfiltered fluid to be discharged from the inside of the housing; 
 fluid suction means capable of suctioning the fluid inside the housing through the waste fluid flow path and gas inflow means for causing a gas to flow into the housing through the downstream-side fluid flow path are provided in the dialysis fluid circuit; and 
 when the filter is to be removed from the dialysis fluid circuit by separating it from the upstream-side flow path, the downstream-side flow path, and the waste fluid flow path, the gas inflow means is opened, and the fluid in the housing is suctioned by the fluid suction means so as to discharge the fluid in the housing to an outside.